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D( k )
3*k = 0
k = 0
3*k = 0
3*k = 0
3*k = 0 // : 3
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
9/k-8 = 10/(3*k)-4 // - 10/(3*k)-4
9/k-(10/(3*k))-8+4 = 0
9/k+(-10/3)*k^-1-8+4 = 0
17/3*k^-1 = 4 // : 17/3
k^-1 = 12/17
-1 < 0
1/(k^1) = 12/17 // * k^1
1 = 12/17*k^1 // : 12/17
17/12 = k^1
k = 17/12
k = 17/12
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